Crankshaft Out-of-Round and Taper

CRANKSHAFT OUT-OF-ROUND AND TAPER





^ Measure the dimensions at four different points as shown in the figure on each main journal and pin journal with a micrometer.
^ Out-of-round is indicated by the difference in the dimensions between "X" and "Y" at "A" and "B".
^ Taper is indicated by the difference in the dimensions between "A" and "B" at "X" and "Y".
Limit:
Out-of-round (Difference between "X" and "Y"): 0.002 mm (0.0001 inch)
Taper (Difference between "A" and "B"): 0.002 mm (0.0001 inch)
^ If the measured value exceeds the limit, correct or replace crankshaft.
^ If corrected, measure the bearing oil clearance of the corrected main journal and/or pin journal. Then select the main bearing and/or connecting rod bearing..